**Congruence** – comparing any 2 objects and know they are the same size or shape.

I developed this entirely solely on prior knowledge. I just thought of what it means to be congruent. You have:

Congruent Segments

Congruent Angles

Congruent Circles

Congruent Triangles

**Formal Definition of Congruence:** being isometric — roughly, the same size and shape (Wikipedia)

**Two-Dimensional**: An object having 2 dimensions, the object will have a perimeter and area. The object can be drawn on a flat surface or plane.

This definition is based on my prior knowledge. Example of two-dimentional figures.

**Formal definition of Two-Dimensional Shapes:** A shape that only has two dimensions (such as width and height) and no thickness.(mathisfun.com)

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Wow! Great definitions and pictoral representations!

Julie, I love the illustrations, they are very clear.